Electric switch.



0. 'A. MUNGER.

ELECTRIC SWITCH.

APPLICATION HLED HAYZB. lflll.

Patentad Apr. 15, 1919.

UNITED STATES PATENT oEEIoE.

DON L HUNGER, 015 DETROIT, MICHIGAN.

I '0 all whom it may concern: 4

Be it known that I, DON A. MUNGER,0ltizen of the'United States, residin at Detroit, county of Wayne, State of 'chi an, have invented a certain newanduseful mprovement-in 'Electric Switches, 'and' declare the 'followingto be a full, clear, and exact descriptionofthe same, such as will enable others skilled in the art to which it pertains to make 1 and use the same, reference bein had: (other accompanyin drawings,'whic form'a'part of this spec cation.

My'invention relates to an electric switch shown in the accompanyin drawings and more particularly describe in the following specification and claims.

One object of my invention is to provide means for opening and closingan electric circuit consisting of one or several paths,

as may be necessary toaccomplish the desired :purpose. I

Another feature of the invention is the iron magnet case, which completely surrounds the magnet, in such manner that when the armature is attracted'by the magnetic I pull, not a partial but a completel closed magnetic circuit is formed on a1 sides of the winding.

A further object of the cast iron magnet case is to dissipate any heat generated by the coil by conduction through the core and magnet'casa' Another object in completely surrounding the magnet with an iron case is that a sluggish, quiet and powerful attraction for the armature is obtained.

Another object of the iron case is the protection of the magnet winding from'mechanical or other injury. I

Another'feature of the invention is that each blow-out shield revolves radially about ts support when necessary to change contacts. 4

With the foregoing and other'objects in view, which will appear as the description proceeds, the inventlon resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that cha in the precise embodiment of the invention herein disclosed, may be made without departing from the spirit of the same.

In the drawings Figure 1 is a front elevation of the switch.

U specification o1 Letterslatent.

Patented Apr. 15, .1919.

Application filed-May 28, 1917. Serial No. 171,363.

Fig. 2 is'a side elevation of the switch showing the pivoted arm in its open position.

Fig. 3 is a side elevation closed. I

Referring now to the letters of reference placed upon the drawings A, denotes a slate panel, B, indicates a cast iron coil retaining case secured to the panel by bolts B. C, indicates a magnet winding, and C, its core. D, designates a swinging cast iron arm or armature pivoted to lugs at the bottom of the ooil'retainer case. The arm D, is free to swing through an are limited in one direction by a lug d, integral with the arm which strikes the outer side of the coil retainer case when said arm is in its open position ;-the arm contactwith the :arm

ing with a brass non-sealin screw E 10 ed in'the core 0, when in its closed position.

Cast integral with the swim g arm is a circular disk D, of suitable thlckness which when in closed position leaves an airgap'of about two-thousandths of an inch between the disk and the iron coil retainer or ma net case B :thus a magnetic circuit may e formed through the core; cast magnetcase; across theslight air gap; through the cast disk of the swinging arm; and back to the COPE.

This circuit, flowing as it does to each and every point, provides a strong magnetic pull, because not only the core attracts the arm and disk, but the outer shell, ofthe magnet case as well, thus forming a completely closed circuit.

Because of this completely closed magnetic circuit, the closing of the arm is quiet as the magnetic pull increases as the arm approaches the core and iron case, and after the arm is in closed position no rebound can take place because of the intense attraction of the core and case for the arm and disk.

The lower end of the arm D, is provided with an aperture D to receive a transverse 'rod (not shown) or other suitable connecting'element, adapted to couple a plurality of the switches together that they may operate in conjunction.

Pivoted to a lug integral with the swinging arm D, at its upper end, is an arm which carries a copper contact G, secure thereto. H, is a rod extendin through holes in the swin arm D, and t e arm F, having a T-shaped head lodged in a recess formed in the swinging "arm for its race]? tion. Sleeved upon the rod H, is a spring held in roper position between two caps I, carried by the rod. F is a hi on the arm F, adapted to bear against t e swinging arm, to limit the action of the spring I. F

is a flexible shunt connecting the arm F,

with the magnet case or lug b, supporting the swinging arm. G, isa stationary con-v tact supported on the end of an arm J, bolted to the slate panel; K, is an electric terminal connected by a bolt with the arm J. To prevent burning of the contacts by an are caused a by 0 ening contacts G and G, a blowout coil la, is provided mounted on the rear of the panel. This coil consists of several turns of wire wound on a spool and mounted on an ironcore L; each end of this core isconnected'to an iron rod L running through the slate panel terminating in two cast iron ears M, secured to the rods by set screws m.

These cast iron cars are disposed on each side of the contacts G and G'.- An asbestos shield N, is secured to the cast iron ears M, to preventburning by the-arc when contacts are broken. Q

As mentioned before.'the swingingarm or armature, is attraotednby the coreand magnet case because of the ma et coil surrounding the core-and inclosed y the .case. This .0011 consists of -many turns of fine copper wire through which a current is passed which causes the desired magnetic pull. The lead wires of this coil pass through hard rubber bushings b, which protect them from chafing. These wires terminate at copper terminals 0, and are known as the control circuit terminals. The other circuit from K to K, is the heavy or working circuit which is to be controlled. When bothrconta'cts G, and G, are ,closed an electric circuit is formed starting at terminal K, through bolt to-arni J, across .copper contacts G and G, throiigharm F, to swingin arm or armature (also by way offiexi 1e shunt F to magnet case B; through bolts holding case to slate anel; to wire connecting series blowout E; and out at -other terminal K. It will be readily seen that when contacts G, and G, are opened the circuit will bebroken.

As long as an arc is maintained across the contacts G, and G, currentv is, flowing through the, blowout coil L. A magnetic flux is set uplin thc iron core ofithe blowout coil flpwing through the iron rods L to the ears M, and across from tip to tip of car through the are, thereby extinguishing it.

Having thus described my invention, what I claim is:

1. An electric switch including circuit clos ing contacts, a fixed bracket having one of the contacts mounted on it, a pivoted armature, a yieldably mounted arm carried by the armature and having the other of said contacts mounted onit, .means for closing the switch, rods su orted intermediate of their ends and provl ed at one end with blades located at op osite sides of the said contacts, said=rod and lades being of magnetic material and a blow-out coil magnetically connected with and supported'by the rods at the other end thereof.

2. An electric switch comprising a supporting panel, a 'bracket mounted on the panel, a" pivoted armature," a yieldably mounted arm carried by the armature, cir- Icuit closing contacts mounted on the said bracket and arm, means ".for closing the switch, rods extending. through the panel.

plates carried bytherods at one end thereof and'located-at opposite sides of the contacts,

.saiid rods and plates being of magnetic material andia'blow-out .coil magnetically connected with and mounted uponthe rods and located at o posite sides 'of the panel from that at whic the contacts are arranged.

3. An electric switch including a anel, rods extending through the panel an provided with means for adjustably engaging the same, a blow-out coil magnetically connected with and mounted upon the rods in rear of the panel, an armature pivotally mounted at the front of the panel, a bracket mounted on the panel above the rods, a yieldably mounted arm carried by the arma- -ture,.circuit closing contacts mounted on the Copies of this patent may be obtained for five cents each, addressing the Goniminioner of 8261;

' i Washington; n.0, 

